Interwar London witnessed an unprecedented housing boom, fuelled in part by the expansion of the tube system. Following the earlier success of the Golders Green extension, new suburbs were vigorously promoted by the Underground. An even more ambitious policy
of suburban development, known as Metro-land, was pursued by the Metropolitan Railway in north west London. Both companies used posters to sell the ideal of a better life in semi-rural surroundings, connected to the city by fast and reliable electric trains.